A mother was jailed for six years today for killing her 20-month-old son after drugging him to make him sleep.

Laura-Jane Vestuto, 28, crushed anti-depressant pills prescribed to her and fed them to the toddler, Renzo.

She had been dosing Renzo for weeks before he developed breathing problems and died after being taken to hospital in September 2007.

Tests showed the drug Amitriptyline had built up in his body and he had 10 times the safe adult dose in his system, the Old Bailey heard.

Traces were found on baby medicine feeders but police believe he may have also been given the drug in his juice or milk.

Vestuto, of Clapton, east London, pleaded guilty in July to causing or allowing Renzo's death. An alternative charge of manslaughter was left to lie on file after she pleaded not guilty.

Judge Peter Thornton told Vestuto she had given Renzo sedatives to make life easier for herself. "Instead of bearing the everyday responsibility of being a parent, caring and loving for your son, you embarked on a deliberate course of administering adult drugs, knowing that was wrong and risky," he said.

"You gave him drugs for purely selfish, self-centred reasons, thinking only of yourself."

The judge said Vestuto had been prescribed the drug seven times in the months leading up to the boy's death, but was not taking it herself when Renzo died.

Traces of other drugs, including painkillers, were also found in his system.

The judge added: "You repeatedly administered these drugs, calmly and deliberately, knowing it was wrong and not the way to care for children."

He said Vestuto had shown little emotion when her son died after being taken to hospital.

She had compounded the suffering of her mother and former husband by denying she had given Renzo the medication and subsequently tried to blame them.